Patent GB-292639-A (GB)
Title: Improvements in electro pneumatic machines for the recording and checking of statistics and the like
IPC: G06K5/00
Filed: 1927-02-22
Abstract: 292,639. Trojani, P., and Ascanio, C. d'. Feb. 22, 1927. Addition to 253,134. Statistical machines.-In the keyboard-operated machine of the parent Specification (1) modified means are provided for unwinding the strip past the reading device so that it could be determined whether or not a certain record or set of data had previously been perforated on the strip. Means are also provided (2) for stopping the machine when the strip has ceased unwinding and (3) for detecting a tear in the edge of the strip. A drum 18 bearing numerals, which show at a window 26, tends to rotate counterclockwise by reason of a spring 19 but is held by a lug D<1> thereon being engaged by the lever 21 coacting with the core of the solenoid 22. Inside the drum 18 are three solenoids A<1>, B<1>, C' which, when energized, project their cores beyond the drum surface. Four solenoids A" - - D" are arranged concentrically with the drum and when energized their cores project into the path of the cores of any energized solenoids A<1> - - C'. Circuited with the solenoids A" - - D" are, bellows A - - D which coact to close the circuits according to the code holes in the strip as in the parent Specification. The transformer, of which 24 is the secondary winding, is in a circuit 27 which is only closed when there is agreement between the number to be detected, which has been set up on the keyboard, and the data read by the paper strip reading device. When this agreement occurs the winding 24 is energized and the appropriate bellows A - - D are also closed by the perforated record strip so that the appropriate solenoids A' - - C' and A" - - D" are energized to project their cores. At the same time the solenoid 22 is energized and releases the drum 18, which thereby rotates until a projected core of the solenoids D" - - A" holds a projected core of the solenoids A' - - C<1>, the arrangement being such that when this occurs the drum 18 exhibits at the window 26 the number on the strip which has been detected i.e. which is in agreement with the number set up on the keyboard. The bellows A - - D may be replaced by solenoids. (2) The plate over which the paper unwinds has a slot connected by a tube 1 to auxiliary bellows 2. These bellows are normally held in the position shown by a counterweight (net shown) but when deflated they close contacts 4 and 6 and energize a solenoid 7 which, through bell crank 10, 12, releases a member 13 which moves upwards and breaks the circuit of the solenoid at 8. The motion of the member 13 also operates a brake to stop the unwinding of the drum carrying the perforated record strip. 3 is an adjustable valve. Against each set of data, and near the edge of the strip, is a hole coacting with bellows 2 so that as each set of data is read bellows 2 commence to deflate. The valve 3 is so adjusted that before the contacts 4, 6 have closed the strip has moved on and stopped this deflation so that the counterweight raises the contact 4 again. When the end of the strip is reached, however, the bellows 2 axe fully donated and contacts 4, 6 close to stop the drum feeding the paper. The bellows 2 may be replaced by a solenoid with a delay action. (3) In order to detect a tear in the paper a bellows 15 coacts with the strip between the extreme edge thereof and the holes coacting with the bellows 2, so that when a tear occurs the bellows 15 are operated to actuate a signalling device 16. The bellows 15 may be replaced by a solenoid.